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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3834ecd36e2721f21a7b5bec43549c98436171e9f0af60b1955351367a796a5' 
  AND token = 'uq6GKbSM9W6LIMIm3/NT5TyEbuytmiOaXEKBjpiGi9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}